/**
 * Cookie plugin
 * 
 * Copyright (c) 2006 Klaus Hartl (stilbuero.de) Dual licensed under the MIT and
 * GPL licenses: http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * 
 */

/**
 * Create a cookie with the given name and value and other optional parameters.
 * 
 * @example
 * $.cookie('the_cookie', 'the_value');
 * @desc Set the value of a cookie.
 *       @example
 *       $.cookie('the_cookie', 'the_value', {expires: 7, path: '/', domain: 'jquery.com', secure: true});
 * @desc Create a cookie with all available options.
 *       @example
 *       $.cookie('the_cookie', 'the_value');
 * @desc Create a session cookie.
 *       @example
 *       $.cookie('the_cookie', null);
 * @desc Delete a cookie by passing null as value.
 * 
 * @param String
 *            name The name of the cookie.
 * @param String
 *            value The value of the cookie.
 * @param Object
 *            options An object literal containing key/value pairs to provide
 *            optional cookie attributes.
 * @option Number|Date expires Either an integer specifying the expiration date
 *         from now on in days or a Date object. If a negative value is
 *         specified (e.g. a date in the past), the cookie will be deleted. If
 *         set to null or omitted, the cookie will be a session cookie and will
 *         not be retained when the the browser exits.
 * @option String path The value of the path atribute of the cookie (default:
 *         path of page that created the cookie).
 * @option String domain The value of the domain attribute of the cookie
 *         (default: domain of page that created the cookie).
 * @option Boolean secure If true, the secure attribute of the cookie will be
 *         set and the cookie transmission will require a secure protocol (like
 *         HTTPS).
 * @type undefined
 * 
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Get the value of a cookie with the given name.
 * 
 * @example
 * $.cookie('the_cookie');
 * @desc Get the value of a cookie.
 * 
 * @param String
 *            name The name of the cookie.
 * @return The value of the cookie.
 * @type String
 * 
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */
jQuery.cookie = function(name, value, options) {
	if (typeof value != 'undefined') { // name and value given, set cookie
		options = options || {};
		if (value === null) {
			value = '';
			options.expires = -1;
		}
		var expires = '';
		if (options.expires
				&& (typeof options.expires == 'number' || options.expires.toUTCString)) {
			var date;
			if (typeof options.expires == 'number') {
				date = new Date();
				date.setTime(date.getTime()
						+ (options.expires * 24 * 60 * 60 * 1000));
			} else {
				date = options.expires;
			}
			expires = '; expires=' + date.toUTCString(); // use expires
															// attribute,
															// max-age is not
															// supported by IE
		}
		var path = options.path ? '; path=' + options.path : '';
		var domain = options.domain ? '; domain=' + options.domain : '';
		var secure = options.secure ? '; secure' : '';
		document.cookie = [name, '=', encodeURIComponent(value), expires, path,
				domain, secure].join('');
	} else { // only name given, get cookie
		var cookieValue = null;
		if (document.cookie && document.cookie != '') {
			var cookies = document.cookie.split(';');
			for (var i = 0; i < cookies.length; i++) {
				var cookie = jQuery.trim(cookies[i]);
				// Does this cookie string begin with the name we want?
				if (cookie.substring(0, name.length + 1) == (name + '=')) {
					cookieValue = decodeURIComponent(cookie
							.substring(name.length + 1));
					break;
				}
			}
		}
		return cookieValue;
	}
};